Universal Asynchronous Receivers & Transmitters

Universal Asynchronous Receiver-Transmitter, more commonly referred to as UART, is a type of serial communication interface. UART’s primary function is to transmit and receive data via a data bus. It allows two devices, such as computers, to carry out data transmission over a wired connection. UARTs convert incoming and outgoing data bytes into a serial bit stream.


These particular UARTs are stand-alone integrated circuits (ICs). However, you can also find UARTs within microcontrollers (MCUs).


UART ICs (integrated circuits) are semiconductor devices which can be integrated into your electronics designs to enable UART communication. UART is a popular method of communication in electronics projects. It enables computer hardware to communicate with other modems and serial devices.


When choosing a UART IC, ensure that it meets the requirements of the modem transmission rate.



What does a UART consist of?


One side of the UART feature around 8 data lines and the control pins. The other side of the UART has two serial wires, the Transmission (TX) and the Receiving (RX).



Communication Standards


UARTs may feature a communication standard which defines the signals between devices. These standards include RS-232, RS-422 and RS-485.



What is baud rate?


UART baud rate is the speed at which the data is transferred which is given in bits per second (bit/s or bps). The devices that you are communicating between should both have the same baud rate.



What does Asynchronous mean?


Asynchronous is a type of serial communication where the interfaces at each end are not synchronised by a common clock signal.



What is USART?


USART is very similar in functionality to a UART device. However, it also offers the possibility of a “synchronous” mode.


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Description Price Number of Channels per Chip Standard Supported Transmit FIFO Receive FIFO Maximum Data Rate Transmitter and Receiver FIFO Counter Mounting Type Package Type Pin Count Typical Operating Supply Voltage Dimensions Length Width Height
RS Stock No. 888-8729
Mfr. Part No.FT231XQ-T
BrandFTDI Chip
SGD2.249
Each (In a Pack of 10)
units
- - - - - - Surface Mount QFN 20 - 4 x 4 x 0.75mm 4mm 4mm 0.75mm
RS Stock No. 686-6055
Mfr. Part No.XR82C684CJ/44-F
BrandEXAR
SGD23.08
Each
units
4 - - - 1Mbit/s - Surface Mount PLCC 44 5 V 16.66 x 16.66 x 3.68mm 16.66mm 16.66mm 3.68mm
RS Stock No. 173-0790
Mfr. Part No.XR20M1170IG16-F
BrandEXAR
SGD5.582
Each (In a Tube of 95)
units
1 IrDA, RS232, RS422, RS485 64B 64B 16Mbit/s Yes Surface Mount TSSOP 16 1.6 → 3.6 V 5.1 x 4.5 x 0.95mm 5.1mm 4.5mm 0.95mm
RS Stock No. 923-1600
Mfr. Part No.FT221XS-R
BrandFTDI Chip
SGD2.551
Each (On a Reel of 3000)
units
1 SIE, UART 512B 512B 1Mbit/s Yes Surface Mount SSOP 20 5 V 0.344 x 0.157 x 0.059in 8.74mm 0.157in 1.5mm
RS Stock No. 913-4225
Mfr. Part No.ST16C2550CQ48-F
BrandEXAR
SGD7.368
Each (In a Tray of 250)
units
2 RS232, RS485 16B 16B 4Mbit/s Yes Surface Mount TQFP 48 2.97 → 5.5 V 7.1 x 7.1 x 1.05mm 7.1mm 7.1mm 1.05mm
RS Stock No. 686-5948
Mfr. Part No.ST16C554CQ64-F
BrandEXAR
SGD11.95
Each
units
4 - 16B 16B 1.5Mbit/s Yes Surface Mount LQFP 64 2.97 → 5.5 V 10.1 x 10.1 x 1.45mm 10.1mm 10.1mm 1.45mm
RS Stock No. 923-7661
Mfr. Part No.MAX14830ETM+
BrandMaxim
SGD25.833
Each (In a Tube of 43)
units
4 RS485 - - 24MBd - Surface Mount TQFN 48 2.35 → 3.6 V 7.1 x 7.1 x 0.75mm 7.1mm 7.1mm 0.75mm
RS Stock No. 811-2971
Mfr. Part No.XR28V382IL32-F
BrandEXAR
SGD5.00
Each
units
2 IrDA, RS232, RS485 128B 128B 3Mbit/s Yes Surface Mount QFN 32 3.3 V 5 x 5 x 0.95mm 5mm 5mm 0.95mm
RS Stock No. 686-5985
Mfr. Part No.XR16C854IJ-F
BrandEXAR
SGD40.23
Each
units
4 IrDA 128B 128B 2Mbit/s Yes Surface Mount PLCC 68 2.97 → 5.5 V 24.33 x 24.33 x 3.68mm 24.33mm 24.33mm 3.68mm
RS Stock No. 646-6327
Mfr. Part No.PC16552DV/NOPB
SGD15.40
Each
units
2 - 16B 16B 1.5MBd Yes Surface Mount PLCC 44 5 V 16.51 x 16.51 x 3.68mm 16.51mm 16.51mm 3.68mm
RS Stock No. 757-0045
Mfr. Part No.FT231XQ-R
BrandFTDI Chip
SGD3.30
Each (In a Pack of 2)
units
- - - - - - - - - - - - - -
RS Stock No. 797-4765
Mfr. Part No.SC26C92C1A
BrandNXP
SGD12.01
Each
units
2 UART - - 230.4kbit/s Yes Surface Mount PLCC 44 5 V 16.66 x 16.66 x 4.06mm 16.66mm 16.66mm 4.06mm
RS Stock No. 757-0051
Mfr. Part No.FT240XQ-R
BrandFTDI Chip
SGD3.165
Each (In a Pack of 2)
units
1 SIE 512B 512B 1Mbit/s Yes Surface Mount QFN 24 5 V 4 x 4 x 0.75mm 4mm 4mm 0.75mm
RS Stock No. 814-4032
Mfr. Part No.TIR1000PSR
SGD2.362
Each (On a Tape of 5)
units
- - - - - - Surface Mount SOIC 8 - 6.5 x 5.6 x 1.85mm 6.5mm 5.6mm 1.85mm
RS Stock No. 913-4247
Mfr. Part No.XR16C854CJ-F
BrandEXAR
SGD33.354
Each (In a Tube of 19)
units
4 IrDA 128B 128B 2Mbit/s Yes Surface Mount PLCC 68 2.97 → 5.5 V 24.33 x 24.33 x 3.68mm 24.33mm 24.33mm 3.68mm
RS Stock No. 700-4374
Mfr. Part No.XR17V358IB176-F
BrandEXAR
SGD25.04
Each
units
8 IrDA 256B 256B 25Mbit/s Yes Surface Mount FBGA 176 3.3 V 13.1 x 13.1 x 1.15mm 13.1mm 13.1mm 1.15mm
RS Stock No. 625-8514
Mfr. Part No.Z0847006PSG
BrandZilog
SGD7.08
Each
units
2 UART - - - - Through Hole PDIP 40 - - - - -
RS Stock No. 146-1017
Mfr. Part No.MAX3100CEE+
BrandMaxim
SGD10.027
Each (In a Tube of 100)
units
1 IrDA 16B 16B 0.23MBd - Surface Mount QSOP 16 2.7 → 5.5 V 4.98 x 3.99 x 1.55mm 4.98mm 3.99mm 1.55mm
RS Stock No. 913-4256
Mfr. Part No.XR16L788IQ-F
BrandEXAR
SGD37.688
Each (In a Tray of 66)
units
8 IrDA 64B 64B 6.25Mbit/s Yes Surface Mount PQFP 100 2.97 → 5.5 V 20.1 x 14.1 x 3.05mm 20.1mm 14.1mm 3.05mm
RS Stock No. 165-9591
Mfr. Part No.MAX3107EAG+
BrandMaxim
SGD16.571
Each (In a Tube of 58)
units
1 RS232, RS485 - - 24Mbps Yes Surface Mount SSOP 24 2.35 → 3.6 V 8.33 x 5.38 x 1.78mm 8.33mm 5.38mm 1.78mm
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